No operation will be sent to MongoDB from the Observable until demand is signaled via this method.

No operation will be sent to MongoDB from the Observable until demand is signaled via this method.

It can be called however often and whenever needed, but the outstanding cumulative demand must never exceed Long.MaxValue.
An outstanding cumulative demand of Long.MaxValue may be treated by the Observable as "effectively unbounded".

Whatever has been requested might be sent, so only signal demand for what can be safely handled.